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From 646456862df8926ba10dd7330abf3bf0f887e1b6 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 26 May 2021 14:31:26 +0900
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Subject: [PATCH] Increase SECTION_MAP_LAST_BIT to 5
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* Required for kernel 5.12
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Kernel commit 1f90a3477df3 ("mm: teach pfn_to_online_page() about
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ZONE_DEVICE section collisions") added a section flag
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(SECTION_TAINT_ZONE_DEVICE) and causes makedumpfile an error on
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some machines like this:
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__vtop4_x86_64: Can't get a valid pmd_pte.
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readmem: Can't convert a virtual address(ffffe2bdc2000000) to physical address.
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readmem: type_addr: 0, addr:ffffe2bdc2000000, size:32768
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__exclude_unnecessary_pages: Can't read the buffer of struct page.
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create_2nd_bitmap: Can't exclude unnecessary pages.
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Increase SECTION_MAP_LAST_BIT to 5 to fix this. The bit had not
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been used until the change, so we can just increase the value.
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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makedumpfile.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/makedumpfile-1.6.9/makedumpfile.h b/makedumpfile-1.6.9/makedumpfile.h
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index 93aa774..79046f2 100644
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--- a/makedumpfile-1.6.9/makedumpfile.h
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+++ b/makedumpfile-1.6.9/makedumpfile.h
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@@ -195,7 +195,7 @@ isAnon(unsigned long mapping)
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* 2. it has been verified that (1UL<<2) was never set, so it is
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* safe to mask that bit off even in old kernels.
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*/
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-#define SECTION_MAP_LAST_BIT (1UL<<4)
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+#define SECTION_MAP_LAST_BIT (1UL<<5)
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#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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#define NR_SECTION_ROOTS() divideup(num_section, SECTIONS_PER_ROOT())
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#define SECTION_NR_TO_PFN(sec) ((sec) << PFN_SECTION_SHIFT())
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--
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2.29.2
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